IWT-5000A Handler I/O Control Mode
The handler I/O is for connecting external controller as automatic use. The external device can
connect EXT_VCC (DC +5V) and EXT_GND. And via ‘MODE’ , ’START’ signal to control the
system test mode (by select sample/ test, and START). You can via handler I/O output PASS’ ,
‘FAIL’ , ‘BUSY’ signal to know IWT-5000A test result is PASS, FAIL. BUSY or finished.
‘
MODE’ & ’START’ is the input signal. When the signal level too high over EXT_VCC 26%, the
system will judge the signal is High. For example, ‘EXT_VCC’=5V, ‘MODE’ > 1.3V, that is High,
‘START’ < 1.2V, that is Low
。
‘
PASS’ , ‘FAI;’ , ‘BUSY’ signals are Open collector output. You can via optical coupling
component connect to single chip or PC I/O card for automatic control. Or directly connect to LED
for display. Please accord the voltage and current to use the suitable resister for current-limit.
You can refer the below external circuit diagram for do a external board.
1.
Please use this diagram connect IWT-5000A handler I/O port (15Pin D SUB Connector)
。
2.
Connect the sample to IWT-5000A. Set the test voltage, DIV, AVG, etc.
3.
Press [System] on the IWT-5000A, and press [F5] ’Ext I/O’. The system will enter external
Handler I/O mode.
4.
Switch the external board [SW1] to OFF. It's the sample mode.
5.
Check if the external board BUSY LED is off. Press [SW2], do not release it, for testing.
During the testing, the BUSY LED will light. After LED off, it means finishing the sampling. You
